import Axios, {
  type AxiosInstance,
  type AxiosRequestConfig,
  type CustomParamsSerializer
} from "axios";
import type {
  PureHttpError,
  RequestMethods,
  PureHttpResponse,
  PureHttpRequestConfig
} from "./types.d";
import { stringify } from "qs";
import NProgress from "../progress";
import { getToken, formatToken } from "@/utils/auth";
import { useUserStoreHook } from "@/store/modules/user";
import { ENABLE_TOKEN_VALIDATION } from "@/config";

// 相关配置请参考：www.axios-js.com/zh-cn/docs/#axios-request-config-1
const defaultConfig: AxiosRequestConfig = {
  // 请求超时时间
  timeout: 10000,
  // 基础URL
  baseURL: "https://dkapi.jiayixunfang.cn/",
  headers: {
    Accept: "application/json, text/plain, */*",
    "Content-Type": "application/json",
    "X-Requested-With": "XMLHttpRequest"
  },
  // 数组格式参数序列化（https://github.com/axios/axios/issues/5142）
  paramsSerializer: {
    serialize: stringify as unknown as CustomParamsSerializer
  }
};

class PureHttp {
  constructor() {
    this.httpInterceptorsRequest();
    this.httpInterceptorsResponse();
  }

  /** `token`过期后，暂存待执行的请求 */
  private static requests = [];

  /** 防止重复刷新`token` */
  private static isRefreshing = false;

  /** 初始化配置对象 */
  private static initConfig: PureHttpRequestConfig = {};

  /** 保存当前`Axios`实例对象 */
  private static axiosInstance: AxiosInstance = Axios.create(defaultConfig);

  /** 重连原始请求 */
  private static retryOriginalRequest(config: PureHttpRequestConfig) {
    return new Promise(resolve => {
      PureHttp.requests.push((token: string) => {
        config.headers["Authorization"] = formatToken(token);
        resolve(config);
      });
    });
  }

  /** 请求拦截 */
  private httpInterceptorsRequest(): void {
    PureHttp.axiosInstance.interceptors.request.use(
      async (config: PureHttpRequestConfig): Promise<any> => {
        // 开启进度条动画
        NProgress.start();
        // 优先判断post/get等方法是否传入回调，否则执行初始化设置等回调
        if (typeof config.beforeRequestCallback === "function") {
          config.beforeRequestCallback(config);
          return config;
        }
        if (PureHttp.initConfig.beforeRequestCallback) {
          PureHttp.initConfig.beforeRequestCallback(config);
          return config;
        }
        /** 请求白名单，放置一些不需要`token`的接口（通过设置请求白名单，防止`token`过期后再请求造成的死循环问题） */
        const whiteList = ["/refresh-token", "/login", "/admin/adminlogin"];

        // 添加investor_id参数到所有请求中
        const userStore = useUserStoreHook();
        const userId = userStore.id;

        // 如果userId存在，则添加到请求参数中
        if (userId) {
          // 针对GET请求，修改params
          if (config.method?.toLowerCase() === 'get') {
            config.params = { ...config.params, investor_id: userId };
          }
          // 针对POST等其他请求，修改data
          else if (config.data) {
            // 如果data是字符串（已经是JSON字符串），则解析后再添加参数
            if (typeof config.data === 'string') {
              try {
                const data = JSON.parse(config.data);
                config.data = JSON.stringify({ ...data, investor_id: userId });
              } catch (e) {
                // 解析失败，直接使用原始数据
                console.warn('无法解析请求data为JSON:', e);
              }
            }
            // 对象类型，直接添加属性
            else {
              config.data = { ...config.data, investor_id: userId };
            }
          }
          // 如果没有data，则创建一个新的data对象
          else {
            config.data = { investor_id: userId };
          }
        }

        // 如果禁用了 token 验证，或者请求在白名单中，则直接发送请求
        if (!ENABLE_TOKEN_VALIDATION || whiteList.some(url => config.url.endsWith(url))) {
          return config;
        }

        // 启用 token 验证时的逻辑
        return new Promise(resolve => {
          const data = getToken();
          if (data) {
            const now = new Date().getTime();
            const expired = parseInt(data.expires) - now <= 0;
            if (expired) {
              if (!PureHttp.isRefreshing) {
                PureHttp.isRefreshing = true;
                // token过期刷新
                useUserStoreHook()
                  .handRefreshToken({ refreshToken: data.refreshToken })
                  .then(res => {
                    const token = res.data.accessToken;
                    config.headers["Authorization"] = formatToken(token);
                    PureHttp.requests.forEach(cb => cb(token));
                    PureHttp.requests = [];
                  })
                  .finally(() => {
                    PureHttp.isRefreshing = false;
                  });
              }
              resolve(PureHttp.retryOriginalRequest(config));
            } else {
              config.headers["Authorization"] = formatToken(
                data.accessToken
              );
              resolve(config);
            }
          } else {
            resolve(config);
          }
        });
      },
      error => {
        return Promise.reject(error);
      }
    );
  }

  /** 响应拦截 */
  private httpInterceptorsResponse(): void {
    const instance = PureHttp.axiosInstance;
    instance.interceptors.response.use(
      (response: PureHttpResponse) => {
        const $config = response.config;
        // 关闭进度条动画
        NProgress.done();
        // 优先判断post/get等方法是否传入回调，否则执行初始化设置等回调
        if (typeof $config.beforeResponseCallback === "function") {
          $config.beforeResponseCallback(response);
          return response.data;
        }
        if (PureHttp.initConfig.beforeResponseCallback) {
          PureHttp.initConfig.beforeResponseCallback(response);
          return response.data;
        }
        return response.data;
      },
      (error: PureHttpError) => {
        const $error = error;
        $error.isCancelRequest = Axios.isCancel($error);
        // 关闭进度条动画
        NProgress.done();
        // 所有的响应异常 区分来源为取消请求/非取消请求
        return Promise.reject($error);
      }
    );
  }

  /** 通用请求工具函数 */
  public request<T>(
    method: RequestMethods,
    url: string,
    param?: AxiosRequestConfig,
    axiosConfig?: PureHttpRequestConfig
  ): Promise<T> {
    const config = {
      method,
      url,
      ...param,
      ...axiosConfig
    } as PureHttpRequestConfig;

    // 单独处理自定义请求/响应回调
    return new Promise((resolve, reject) => {
      PureHttp.axiosInstance
        .request(config)
        .then((response: undefined) => {
          resolve(response);
        })
        .catch(error => {
          reject(error);
        });
    });
  }

  /** 单独抽离的`post`工具函数 */
  public post<T, P>(
    url: string,
    params?: AxiosRequestConfig<P>,
    config?: PureHttpRequestConfig
  ): Promise<T> {
    return this.request<T>("post", url, params, config);
  }

  /** 单独抽离的`get`工具函数 */
  public get<T, P>(
    url: string,
    params?: AxiosRequestConfig<P>,
    config?: PureHttpRequestConfig
  ): Promise<T> {
    return this.request<T>("get", url, params, config);
  }
}

export const http = new PureHttp();
